/Engine/Plugins/Runtime/nDisplay/Source/DisplayCluster/Public/Render/Viewport/IDisplayClusterViewportManagerProxy.h
Find viewport render thread proxy object and context number by stereoscopic pass index [Rendering thread func]
[IDisplayClusterViewportProxy](API\Plugins\DisplayCluster\Render\Viewport\IDisplayClusterViewportProxy) * FindViewport_RenderThread ( const int32 StereoViewIndex, uint32 * OutContextNum ) const